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Sometimes, while constructing or revising equipment, it is necessary to drill a hole in the chassis from the bottom since parts already mounted on the top side are in the way of the drill. I have found that a sharp hand awl or ice pick, when pressed down and rotated from the top of the chassis, will easily pierce the aluminum so that the hole can be positioned and drilled from the opposite side. This method is especially useful when a drill press is used and such components as i.f. transformers and tube sockets have already been mounted.
Mel Hart, W0IBZ.